Dado-guide



(No Model.)

W. S. GOMSTOGK.

DADO GUIDE. y No. 410,348. Patented Sept. 3, 1889.

Wf/j@ Y I i@ INVENTH:

A from/ns.

UNITED STATES PATENT OFFICE.

VILLIE S. CMSTOOK, OF BINGHMTON, NEW YORK.

DADO-GUIDE.

SPECIFICATION forming part of Letters Patent No. 410,348, dated September 3, 18,89.

Application filed September 15, 1888. Serial No. 285,506. (No model.)

To all whom, t may concern:

Be it known that I, WILLIE S. CoMsrooK, of Binghamton, in the county of Broome and State of New York, have invented a new and Improved Dado-Guide, of which the following is a full, clear, and ,exact description.

My invention relates toa dado-guide adapted for use in connection with a dado-plane, and has for its object to provide a portable device of simple and durable construction and convenient of Inanipulation which may be expeditiously applied to or detached from a piece of timber and guided to produce a straight or a diagonal cut.

The invention consists in the construction and combination of the several parts, as will be hereiuafterfully set forth, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming apart of this specification, in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a plan view of the device. 2 is a longitudinal section on line n: :r of 1, and Fig. 3 is an end View.

In carrying out the invention the body 10 is preferably rectangular in contour and provided with a central longitudinal slot 11, and a guide-strip 12 integral with or attached to one side. Within the slot 11 head and tail blocks 13 and 14 are held to slide in any approved manner. At one end of the body 10 a cam-plate 15 is pivoted, provided with a handle 16 and an eccentric rib 17, as best illustrated in Fig. 1. The eccentric rib 17 is adapted to slide in a groove produced in a stud 18, secured to the tail-block 14. The forward end of the stud 18 is recessed to receive a flangelQ, formed upon the back of a clamping-jaw 20, the inner face of which jaw is preferably toothed, corrugated, or otherwise roughened, as best illustrated in Fig. 2.

The clamping-jaw 20 is pivoted upon the tail-block 14, to move therewith, through the Fig. Fig.

medium of a screw passing through the studV 18 into the said tail-block, as shown in Fig. 2. A rack 21 is formed integral 'with one side wall of the slot 11, which rack extends from a point at or near the center of the slot to onel end thereof. The rack 21 is adapted to be engaged by a spring-actuated bolt 22, held to slide in the head-block 13, the said bolt being manipulated by a button 28, attached thereto and passing upward through a suitable slot in the said head-block, as clearly illustrated inFig. 2. To facilitate the manipulation of the bolt 22, a thumb-piece 24 is attached to the upper face of the head-block in central transverse alignment with the button of the bolt.

Upon the under side of the head-block 13 a clamping-jaw 25 is pivoted, the face whereof is contiguous to the face of the lower clamping-jaw 20. A circular flange 26 is projected at a right angle outward from the jaw 25, in which flange a segmental recess is produced. A bolt 27is passed through the head-block 13 and also through the segmental recess in the clamping-jaw 25, the head of the said bolt being in frictional engagement with the face of the flange 2G, as best shown in Fig. 2, and the upper end of said bolt, which extends beyond the upper face of the head-block, is provided with a hand-nut 28, whereby, when the said nut is screwed down to a contact with the upper face of the head-block, the outer jaw 25 will be held rigid.

If in practice it is found desirable, the bolt 27 may be projected downward instead of upward, as shown in Fig. 2, and the threaded surface provided with a wing-nut 29, as illustrated in Fig. 3.

In operation, the lines upon which the dado is to be cut having been drawn upon the timber, the said timber is placed between the two jaws 2O and 25, the outer jaw 25 having been previously loosened. The outer edge of the guide-plate 12 is adjusted parallel with one of the lines produced upon the timber, and the cam-plate 15 is manipulated by the handle 16 to for'ce the lower jaw upward and outward to a firm contact with the approaching edge of the timber, as illustrated in Fig. 1. The bolt or set-screw 27 is now tightened, whereby the upper jaw, which has followed the upper edge of the timber, is held iirinly in contact with said timber. By passing a dado-plane over the face of the timber in contact with the guiding or straight edge 12 of the device a dado is expeditiously and truly cut. The ends of both jaws lie within the plane of the outer face of the straight- ICO edge or guide 12, as shown in Fig. 1, so that they will not project into the path of the cutter as it is reciprocated along the said edge or guide to cut across the timber on the lines shown in said figure.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. A dado-guide consist-ing in the body or frame 10, having one longitudinal edge formed or provided with a straight-edge or guide 12, an adjustable head-block 13 in said slot at one end, a sliding tail-block in the opposite end of the slot, a pivoted cam for reciprocating said tail-piece, a jaw pivoted to freely turn on the under side of the tail-piece, a jaw pivoted to turn freely on the lower face of the headpiece and provided with a segmental slot concentric with its pivot, and an adj listing-screw whereby, when the tail-jaw is set at'the desired angle against the material, the headjaw will, when forced against the material, adjust itself to said angle, substantially as set forth.

f2.v The combination, with the base or body having a straiglitedge or guide along one longitudinal edge, of lon gitudinally-ad justable head and tail pieces thereon having horizontally-turning clamping-j aws the ends of which lie wholly within the plane of the outer face of said straight-edge, substantially as set forth.

3. The combination, with a frame 10, having a longitudinal slot through it from its upper to the lower face, a rack on one Wall of the slot, the head-piece 13, sliding in the slot and having a transverse catch engaging the rack, the jaw 25, pivoted to the lower side of the head-block and having a curved slot, and a screw 27, extending up through said slot and block to the upper side of the frame and provided with a thumb-nut, of the tail-piece 14, sliding in the opposite end of the slot and provided with a stud 18 on its under side, the cam-lever pivoted to the frame and having a rib engaging the stud to positively throw the tail-block in either direction, and the jaw 20, secured to the tail-block, substantially as set forth.

NVILLIE S. COMSTOCK.

" Vitnesses:

HORATIO D. BRooKs, ORSINE COMSTOCK. 

